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Related Concept Videos

The Ideal Transformer01:26

The Ideal Transformer

In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's tangential component...
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The winding...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Galvanometer01:24

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform magnetic...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.

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Related Experiment Video

Updated: Jun 15, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Magnetooptical current transformer. 1: Principles.

A Papp, H Harms

    Applied Optics
    |March 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Magneto-optical methods enable current measurement in high-voltage lines using optical fibers as sensors. Birefringence effects on the measurement signal are analyzed.

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    Magnetic Tweezers for the Measurement of Twist and Torque
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    Published on: May 19, 2014

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    Last Updated: Jun 15, 2026

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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    Published on: November 21, 2019

    Magnetic Tweezers for the Measurement of Twist and Torque
    11:41

    Magnetic Tweezers for the Measurement of Twist and Torque

    Published on: May 19, 2014

    Area of Science:

    • Physics
    • Electrical Engineering
    • Optics

    Background:

    • High-voltage current measurement is critical for power system monitoring and protection.
    • Traditional methods face challenges in harsh electrical environments.

    Purpose of the Study:

    • To describe principles of magneto-optical current measurement in high-voltage lines.
    • To explore the use of optical fibers as integrated transmission lines and sensors.
    • To analyze the impact of birefringence on measurement accuracy.

    Main Methods:

    • Utilizing the Faraday effect for current-induced magnetic field detection.
    • Employing optical fiber as both a signal transmission medium and a sensing element.
    • Investigating polarization changes in the optical signal due to birefringence.

    Main Results:

    • Demonstrated feasibility of magneto-optical current sensing with optical fibers.
    • Quantified the influence of fiber birefringence on the measurement signal.
    • Identified potential strategies to mitigate birefringence effects.

    Conclusions:

    • Optical fiber-based magneto-optical current sensing offers a promising alternative for high-voltage applications.
    • Understanding and managing birefringence is crucial for accurate measurements.
    • Further research can optimize sensor design and signal processing for enhanced performance.